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Considering only the initial and final situations, identify which mechanical energies have changed. In addition, determine whether you will need to consider any work done by external forces or changes in thermal energy.
A) Kinetic energy has changed.
B) Gravitational potential energy has changed.
C) Spring potential energy has changed.
D) Work by external forces on the system must be considered.
E) Thermal energy of the system has changed.

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akujorclinton

Answer:

Explanation: Gravitational potential energy is converted to other forms of energy, such as kinetic energy. If we release the mass, gravitational force will do an amount of work equal to \text{mgh} on it, thereby increasing its kinetic energy by that same amount .

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